Drill-steel retainer



G. GLufLE. DRILL STEEL RETAINLR.- APLLICATION'HLED Aue.13,19'2p .r

xffpgemed-irf 25, 1922 A v2SHEETS-SHEET1.

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G. G. TUTTLE.

DRILL STEEL RETAINER. APPLICATION FILED AUG. I3, 1920.

Patented Apr. 25, 1922'.

2 SHEETS-SHEET 2.

' INVENTOR' v wpmwfmj.

/ ATT'o NEY vUNurliD STATES-PATENT. OFFICE..

GROVER GOODRICH TU TTLE, 0F PHILLIPSBURG, NEW JERSEY, ASSIGNOR TOING-ER- SOLL-RAND COMPANY, O JERSEY CITY, NEW JERSEY, A CORPORATION OFNEW JERSEY.'

DRILL-STEEL RETAINER.

embraces the drill steel and is suitably held or clamped in-positionupon the front' head of the machine. f

Such yoke retainers are subjected to severe impact as the colla-r on thedrillsteel strikes the yoke and various devices have been employed to`cushion or yieldingly hold the yoke to avoid breakage of the parts, someof these devicesV inclu-ding bolts and springs,4

but the breakage is diflicult to overcome, and the more complex theparts, 'the greater the danger of breakage becomes.'

The primary objects of the present invena citizen of the United States,and

tion are to simplify the retainer 'construction, and reduce the chancesof breakage by avoiding the use of retainer bolts and supporting theyoke retainer from the front head of the machine by means of anarrangement of main and supplementary springs which cushion the yoke inboth directions.

Another ob]- ect of the invention is to supplement the expansive forceof the `main springs in holding the retainer, by means of fluid underpressure, which may loe the live pressure taken from'the supply 'inletsure fails for any reason, the main retainer of the machine. In suchcase, if the pressprings still fulfill vthe function of exertingpressure tov cushion the yoke.

To these ends the invention is shown in its preferred form in theaccompanying draw ings, in which Figure l vis a side elevation of thefront head of a rock drill having my drill steel retainer appliedthereto, a portion of the wall of one of the spring holding guidesbeingvshown broken away,

igure of the front head on the line 2-2 of Figure 3 4looking in thedirection of the arrows, 'i

2 is a vertical sectional elevation` i Specification of Letters Patent..Patented Apr.' 25, 1922. Application filed August 1'3, 1920. SerialNo.403,250. l

Figure 4 is a vertical sectional elevation of a front head showing amodified form of the drill steel retainer,

Figure 5 is a detail view partly in section showing one form of bearingblock for the ends of the yoke,

Figure 6 is a similar detail view showing another form of bearing block,and Flgure 7 is a detail perspective view showing a bearing block forthe en ds of the yoke in the form of a cylinder.

.Referring to the drawings, A represents the front head of a rock drillhaving the nose piece B, adapted to receive the front head bushing Cthrough which thedrill steel D having the collar E, is adapted to extendin position to receivethe impact blows of the hammer. The front head isprovided with the usual lugs F through' which the side bolts G extendfor clamping the cylinder and front head together.- In this instance thefront end' portion H of the cylinder casing is shown partly brokenaway-t0 indicate the relation of the parts.

In accordance with my invention the fronthead 4is provided with springseats J at opposite sides of the lvmachine and main coiled springs K aresupported on said' seats. Spring holding guides L preferably in -theform of sockets are also provided on the front head in longitudinalalignment with the seats J and supplementaryl coiled springs O, whichmay be lighter than the'main coiled springs K, are arranged in saidguides L. The outer walls o'fv the springholding guides L are slotted asshown at P and a yoke retainer Q, bent at the vportion R to embracev thedrill steel, is provided with arms S having hook shaped ends T supportedbetween the said sets of springs K and O so that the yoke retainer iscushioned in both directions. The

bent ends T of theyoke are slidable in the slots P in thespring'vholding guides,and

bearing caps U are preferably providedover the opposed ends of thesprings K and O- so that the bent, ends T of thefy'l're are' heldbetween the said bearing 4caps instead of dil rectly against the springsin order to avoid wear on the springs-and aid in centering the yoke.

Figure 3 is la top plan view of the front?.

head with the "drill casing and front head bushing removed, A

removed from the machine and themain In assembling the parts theffronthead. is

coiled 'springs K are irst inserted through the open ends of the springlanding-.guides and placed onthe seats J with the bearing caps U 'on thesprings. The yoke retainer is then placed in position in the slots P and44apertures in the spring holding guides and from the supply'inletof theinachine'andif form covers .to hold the s rines and voke in position.The yoke is maintained inoperative position, as'indicated iii r'ulllines in -Figure l by means ot' the depressions lV in the faces ot' tkhespiiiig seats J and the yoke may be swung into the 'position indicatedin dotted lines in Figui-el, for' removal of the drill steel whendesired. It desired, oiling apertures X nay be provided in the walls ofthe spring seats J so that fby oiling.the seats oil will reach thecontact 'laces' between the arms of the yoke and the depressions lV inthe springl seats.

In the operation of the device it will .be observed that the maincoiledsprings K take the shock of the impact ot' the collar E ot' thedrill steel upon the yoke and cushion the blow in that direction. Thesupplementary springs cushion Ithe yoke in the opposite direction andobviously need not be as'strong as the main coiled springs K. By mycoi'istruction I avoid the use.ot` retainer bolts and fastening devicestherefor, and depend upon the springs for cushioning the yoke, but Iguide the yoke and springs in the spring'hdldingI guides and on thespring seats in a simpleand efficient manner which avoids breakage bothof the springs and the yoke.

In the modification shown in Figure 4, the

walls Y ofthe spring seats J are lengthened and in this instance t'ormcontinuations of the outer walls of the spring holding guides L.Somewhat lighter main coiled springs` K aresliown seated on 'the springseats J and bearing caps in the form of thimbles Z are placed over themain coiled springsit` and extend within the vwalls'of the spring seats.

seats and the bearing thimblesv Z in order toy supplement the expansive'force ot the liuid under pressure. may be supplied. This fluid underpressure may be the live pressure the luidpressurefails the springs Kstill fulfill their function ofcushioning the yoke.`

The uidpressure maintained within" the bearing thimbles Z supplementsthe spring pressure, enables lighter springs to be used and aids inpreventing breakage oi" the springs and breakage of the yoke.` Itclesired,4the chambers within" the spring seats The object of thisconstruction is to; permit fluid under pressure -to be supplied to ,thetelescopiccliainbers formed bythe springl J may be filled with oil orgrease to further aid the cushioning ot' the yoke land prevent breakageof the springs.

In the modification shown iii Figure 5, a bearing block c in the formot' a ball having a square. hole (l is shown adapted to vtit over thesquare bent end e of the yoke arm S,

in this instance the yoke being formed of square stock instead of roundstock.v The bearing plug or ball c is preferably provided with a flatsurface j' adapted to b ear on one or' the bearing blocks U oi to bearupon the bearing thiinble Z. It desired the face g ot' the bent end e ofthe yoke could be riveted or otherwise rigidly secured in the bearingplug o. In using a yoke with bearing'plugs 0 at each end, the bearingcaps U for the supplementary springs O maybe dispensed with if desired.

In the modification shown in Figure G'the the yoke arm S which in thisinstance is shown formed of round stock.

I claim: l. A drill steel retainer for rock drills,

comprising springseats 'rigidly connected to l opposite sides o1E thefront headof the machine, main coiled springs supported on said seats,spring holding guidesin the form of sockets on the iront headinlongitudinal alignment with the saidigseats, supplementary coiledsprings arranged withinfs'aid sockets, and a yoke 'retainer for the'drill steel having the ends of its,v arms extending through thesocketsan'd supported between 'said sets of springsfand leuslrionednbothffdirections, wherebyf'the said main lcoiled theyoke retainenlf)lgdrill steel f' retainer springstake theshock of impact .ofthe steellier', rock drills comprising spring'seats at'fpposite sides ofztghetrontheadof the machine,1 ma1n coiled ,springs `supported on sai dseats," spring holding guidesin the` forrr of'isockets on the .fronthead in longitudinal*alignment with the said seats, said guides havinglongitudinal slots in their outer walls," supplementary f coiled springsarranged insaidf guides, and a yoke retainer for the drill steeihavingthe ends of its arms slidably-siipported iny said guide slots betweensaid sets of springs and thereby cushioned in both directions.

3. A drill steel retainer for rockdrills,

comprising spring holding guides and spring seats in longitudinalalignmentat opposite sides of the front head of the machine, main coiledsprings on said seats, supplementary coiled springs in said guides,bearing caps4 over the opposed ends of said springs, and a oke retainerfor the drill steelA having the ends of its arms supported between saidsets of bearing caps and thereby cushioned by the springs in bothdirections.

4. I A drill steel retainer for rock drills comprising springholdingguides and spring seats in longitudinal alignment at opposite sidesofthe front headof the machine, main coiled springs on said seats,supplementary .coiled springs in said guides, bearing caps in the formof thimbles arranged over the ends of the said main coiled springs andeX- tending within the walls of thespring seats,

a yoke supported between said sets of springs, and means for maintainingfluid pressure within said bearing thimble to supplement the expansiveforce of the main coiled springs.

5. A drill steel retainer for rock drills comprising spring holdingguides and spring seats in longitudinal alignment at opposite sides ofthe front head of the machine, main coiled springs on said seats,supplementary coiled..springg in said guides, bearing caps in the formof thimbles arranged over the ends of the said main coiled springs andeX- tending within thewallsof the spring seats,

bearing caps over the ends of the supplementarysprings, a yoke retainerfor the drill steel having the ends of its arms supported between saidsets of bearing caps, and means vfor maintaining fluid pressure withinsaid bearing thimbles to supplement the eXpan-` sive force of the maincoiled springs. A l

46. A drill steel retainer for rocl drills, comprising spring holdingguides and spring -seats at opposite sides of the front head of..

the machine, coiled springs in said guides and on said seats, and a yokeretainer for the drill steel having the ends of its arms` provided withbearing blocks Supported between saidsets of springs whereby tlie yokeretainer is cushioned in both directions.

' 7. A drill steel retainer for rock drills,

comprising spring seats at opposite sides of the front head` of themachine, main coiled springs supported on said seats, spring holdingguides in the form of sockets on the front head in longitudinalalignment with @par tary coiled springs in said sockets, the main icoiled springs being supported on said seats, a yoke retainer for thedrill steel having the ends of its arms supported between said sets ofmain and supplementary springs 'and cushioned in both directions, andmeans for maintaining iuid pressure within said sockets to supplementthe expansive force of the main coiled springs.

9. A drill steel retainer for rock drills comprising spring holdingguiding sockets and spring seats at opposite sides of the front head ofthe machine, coiled springs in said sockets and on said seats, a yokeretainer for4 the drill steel having the ends of pressure within saidsockets to supplement the expansive force ofthe springs.

lO. A drill steel retainer for rock drills, comprising coiled springsmounted ony thefront head of the machine, a yoke retainer for the drillsteel having the ends of its arms cushioned by said springsfand fluidpressure means exerting pressure on said yoke arms for supplementing theexpansive force of said cushioning springs.

l1. A drill steel retainer for rock drills, comprising a retainingmember for the drill steel and means 4for mechanically and pneumaticallycushioning said retaining member. 12. Adrill steel retainer for rockdrills,

its 'arms Vsupported and cushioned on said springs, and means formaintaining iiuid comprising a retaining member for the drill steelsupported from the front head of the machine, and devices formechanically cushioning said retaining member including additionalpneumatic means supplementing the said mechanical cushioning devices.

In-'testimony whereof I have signed this specification. y

i GROVER GOODRICH`TUT-TLE.

